Upgraded Mac Mini to 10.6.4 now have sound problems

Just upgraded my mac mini to 10.6.4 and now have sound distortion. Itunes is extremely tinny sounding, fades in and out, distorted and muffled sounding continually. Sound worked fine since I purchased it back in november but now since the update it is distorted. I also notice that if I listen using iphone headphones the sound is just as distorted.
Any ideas how to resolve this? I tried reloading itunes, checked sound/speaker preferences, rebooted the system a couple times, unhooked speakers and reconnected them. I am totally frustrated with this.
thanks for any help on this issue.

have you repaired permission before and after the upgrade ?
also, did you use *software update* from the  menu to install the upgrade ?
if so, download the combo updater from here http://support.apple.com/kb/DL1048 and apply it.
JGG

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